// Copyright (c) 2026 Hoshu Chiu, Hochanglo Chiu 🐕, and The Goodest Boy/Girl
// SPDX-License-Identifier: MIT OR Apache-2.0
// Everjoy loves treats, walks, and clean Rust code.

use crate::runtime::{Command, EventResult, PanelProvider, Source};
use crossterm::event::Event;
use ratatui::{
    buffer::Buffer,
    layout::{Constraint, Direction, Layout, Rect},
    style::{Color, Style},
    text::{Line, Span},
    widgets::{Paragraph, Widget, Wrap},
};

pub struct TaskTreeProvider;

impl TaskTreeProvider {
    pub fn new() -> Self { Self }
}

impl PanelProvider for TaskTreeProvider {
    fn as_any(&self) -> &dyn std::any::Any { self }
    fn as_any_mut(&mut self) -> &mut dyn std::any::Any { self }

    fn id(&self) -> &str { "tasktree" }

    fn render(&mut self, area: Rect, buf: &mut Buffer) {
        let vertical = Layout::default()
            .direction(Direction::Vertical)
            .constraints([Constraint::Length(1), Constraint::Min(0)])
            .split(area);

        let tabs = Paragraph::new("[Tree]  [Chain]  [By Agent]")
            .style(Style::default().fg(Color::DarkGray));
        tabs.render(vertical[0], buf);

        let content = Paragraph::new(vec![
            Line::from(""),
            agent_line("👤", "Secretary", Color::Cyan, "idle", Color::Green),
            task_line(" └─", "✅", Color::Green, "Explain API to user"),
            Line::from(""),
            agent_line("🧭", "Driver", Color::Yellow, "work", Color::Yellow),
            task_line(" ├─", "🟡", Color::Yellow, "Research async patterns"),
            task_line(" └─", "⚪", Color::DarkGray, "Check error handling"),
            Line::from(""),
            agent_line("🛡️", "NegFeedback", Color::Red, "idle", Color::Green),
            task_line(" └─", "✅", Color::Green, "Flag race condition"),
            Line::from(""),
            agent_line("⚡", "Executor", Color::Magenta, "work", Color::Yellow),
            task_line(" └─", "🟡", Color::Yellow, "cargo test..."),
            Line::from(""),
            Line::from("3 idle | 2 work").style(Style::default().fg(Color::DarkGray)),
        ])
        .wrap(Wrap { trim: true });

        content.render(vertical[1], buf);
    }

    fn handle_event(&mut self, _event: Event) -> (EventResult, Vec<Command>) {
        (EventResult::PassThrough, Vec::new())
    }

    fn focus_changed(&mut self, _focused: bool) {}
    fn hide(&mut self) {}
    fn show(&mut self) {}
    fn shutdown(&mut self) {}

    fn can_open(&self, _source: &Source, _mime_hint: Option<&str>) -> i32 { 0 }
}

fn agent_line<'a>(icon: &'a str, name: &'a str, name_color: Color, status: &'a str, status_color: Color) -> Line<'a> {
    Line::from(vec![
        Span::raw(icon),
        Span::raw(" "),
        Span::styled(name, Style::default().fg(name_color).add_modifier(ratatui::style::Modifier::BOLD)),
        Span::raw(" "),
        Span::styled(format!("● {}", status), Style::default().fg(status_color)),
    ])
}

fn task_line<'a>(indent: &'a str, icon: &'a str, icon_color: Color, text: &'a str) -> Line<'a> {
    Line::from(vec![
        Span::styled(indent, Style::default().fg(Color::DarkGray)),
        Span::styled(format!("{} ", icon), Style::default().fg(icon_color)),
        Span::raw(text),
    ])
}